why does a light ray deviate in refraction
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Answer:
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A light ray deviate in refraction. This is so because of the change in the speed of light ray while travelling fron one medium to another.
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Answer light rays deviate when they come in contact with optically denser medium because the speed of the light changes. this view point may seem a little disbelieving when you are familiar with general and special relativity since the speed of light most remain the same no matter the circumstance according Einstein but in reality it dose not break the theory. but for a simple answer it is because the speed of light changes and the direction of the wave of light is perpendicular to the new wave front created.
refractive index = speed of light in air / the speed of light in the relative medium
Explanation: